Syracuse, NY -- As Rick Springfield's case in Syracuse nears jury deliberations, his buttocks has emerged as the weapon accused of causing "serious, disabling and permanent injuries" to a Liverpool woman during a 2004 State Fair concert.

A photo, reportedly of Springfield's buttocks, was shown to the jury during the entertainer's testimony Tuesday.

When asked whose buttocks was shown in the photo, Springfield responded: "Possibly mine."

The 1980s pop icon's rear end is the instrument that Vicki Calcagno, 43, claims struck her during a Chevrolet Court concert and left her dazed or unconscious. Her lawsuit claims he fell backwards into her, causing the injuries.

Her lawyer, Kenneth Goldblatt, said that photo was taken while Springfield was in the crowd during the 2004 concert. A copy was not available during trial.

Closing arguments are expected this morning before state Supreme Court Justice Anthony Paris. The jury should start deliberating by lunchtime.

The case centers around a part of Springfield's act in which he leaves the stage for seven to eight minutes and enters the crowd. A review of the 2004 concert described Springfield shaking his buttocks at fans, climbing among them and making sexually-suggestive gestures with his guitar and a can of silly string.

After being struck by Springfield's buttocks, Calcagno did not realize how injured she was and continued taking photos of the concert, her lawyer said. She did not seek immediate medical help and rushed to catch the shuttle bus from the fair.

But two days later, a doctor documented her injuries. They included pain in her head and neck, muscle spasms, shoulder tightness, loss of sleep, shooting pain in left eye and right foot and sensitivity to bright light.